Coal-dust furnace



June 2 5 1924.

J. TAYLOR COAL DUST FURNACE Filed May 23 1921 3 Sheets-Sheet l INVENTQQJR BY g/ /n ATTORNEY June 24 1924.

J. TAYLOR COAL DUST FURNACE 3 Sheets-Sheet 2 Filed May 23, 1921 A TTORNE V June 24 1924.

J. TAYLOR COAL DUST FURNACE Filed May 23. 1921 3 Sheets-Sheet 5 INVEgZ/OyI/EZdl A TTORNE Y YBY ' e ,le 24, 1924.

3Q TAYLOR, OF SALT E CITY, UT 5:.

coAL-nus'r immmon.

Application filed m 23, 1921. Serial No. 471,793.

This invention relates to coal dust fur naces adapted to burn fine fuel in suspension and it has for its object to provide improved means .to brin about an intimate mixture of coaldust with the necessary air to support substantially perfect'combustion. Briefly stated my improved furnace comprises a primary combustion chamber and a secondary combustion chamber; fine'fuel in suspension in a stream of air entering the primary combustion chamber and being ignited therein and the products of combustion passing from the rear end of this primary combustion chamber into a secondary combustion chamber from which heat is re-. fiected back into the primary combustion chamber for the purpose of raising the temperature of the incoming fuelu The arrangement of the parts is such as to bring about a whirling movement of the fuel and the products of combustion-so that an intimate mixing of the fine fuel and air and the previously ignited gases is brought about with a consequent marked increase in efliciency.

Further objects and advantages of the in: vention will beset forth in the detailed description which follows. i

In the accompanying drawin s:

Fig. 1 is a front elevation of the furnace of my invention illustrating the door thereof and the controlling latches for the same;

Fig. 2 is a transverse vertical sectional view of the furnace upon line 2-2 of Fig. 4:;

Fig. 3 is a plan view of the furnace with the cap of the secondary combustion chamber removed;

Fig. 4 is a longitudinal vertical section upon line 4-4 of Fig. 2-; I

Fig. 5 is a-transverse vertical sectional view of a modified form of the furnace upon line 55 of Fig. 7

Fig. 6 is a transverse sectional view through the secondary combustion cha1'n her on line 6-6 of Fig. 7;

' Fig. .7 is a longitudinal sectional view upon line 77 of Fig. 5; and Fig. 8 is a perspective view of the fuel and air supply pipes with the associated parts ndicated in dotte'dline.

Like numerals designate corresponding parts'throughout the several figures of the drawings.

In the form-of. the invention illustrated in Figs. 1 to 45;"5 designates the primary combustion chamber which is of circular formation and lies with itsaxis' substantially horizontal. The front of the rirnary combustion chamber 5 'is 'closed y a plate 6 which may be of fire-brick or other-heat resisting material. A door 6 disposed outwardly of the plate 6 is hinged, as indicated at 6". Latches 28 are pivoted to the door at. 28? and cooperate Wltll' the keepers 28. An operating handle 8 is common to a pair of links 29 to the ends of which links these latches 28 are pivotally connected. Thus *upon shifting of "the handle either to the right or to the left, the latches will be actuated to lock the doorin closed posi tion or to release the same as the case may be. The circumferential wall of the primary combustion chamber 5 is formed of fire-brick or other highly heat resistant material and,-'

if desired, this fire-brick may be enclosed within a metallic shell 5 (see Fig. i). 1 At its rear end the combustion chamber 5 opens 1 into the coniformcombustion chamber 9, hereinafter referred to as the secondary combustion chamber. The walls of this chamber are also of fire-brick or other highly heat resistant material and the same is trueof a cap or closure 32 seated u on the top of the material 31 within whic the chamber 9 is formed". A discharge "pipe 10 for the products of combustion passes laterally from the upper end of the coniform. secondary combustion chamber 9 and is preferably disposed tangentially with respect thereto and -1s formed in the fire-brick material 31.

lid

till

. tension 15 directing such slaginto the pit in which the several parts are enclosed.

This air rises and after becoming heated enters a pipe 13 passing downwardly through said pipe into a pipe 14; and be ing thereby discharged through the branch pipes 16 and 17 into the lower part of the secondary combustion chamber 9 and into the primary combustion chamber 5 respectively. The discharge of this air into the primary combustion chamber is at a point further on in the circumference of this chamber than the point at which the pipe 12 entersand the entry of the branch pipe 16 into the lower portion of the secondary combustion chamber 9* is at such an angle as to keep up the whirling action which has been imparted to the air and powdered coal dust and the products of combustion in the primary combustion chamber. By an inspection of the drawings it will be seen that the lower rear side of the secondary combustion chamber opens into the rear end, of the primary combustion chamber. Thus the products of combustion with a whirling motion imparted thereto pass from the primary combustion chamber into the secondary combustion chamber while the rear wall of the secondary combustion chamber acts to reflect.

7 coarse coal being carried into the secondary combustion chamber before becoming com pletely ignited for the reason that there would not be sufficient heat in the primary combustion chamber to heat the incoming fuel above the kindling point.

- The invention contemplates the provi sion-of a steam pipe 18 entering the lower portion of the pipe 17 and acting a blower both to force the air with great velgcity into the primary combustion chamber and to draw the heated air more rapid ly through the pipe 13. Any slag which dro s into the pipe 16 from the secondary combustion chamber 9 will be collected in the pipe 19 which constitutes an extension of the pipe 14 (see Fig. 8). In like manner an extension 15 of pipe 1? collects any slag that may drop into the pipe 1"? from the primary combustion chamber, this en:-

20* {see Fig. 8). 'll igs. 2 and 4c difier from Figs. 5 and 7 m'that in Figs. 2 and 4: the supply pipe 2 for the fuel is provided with two branches which enter the=primary combustion chamber at difierent points in its circumference. these branches being designated 2 and 2 otherwise the structures are, practically. the same, except that in Figs. 2 and 4 clean out, openings 15 and 19 are provided for the primary and secondary combustion chambers, these clean-out openings being provided with doors 15 and 19 respectively, which'doors close by gravity. The material 31* and 32* of Fig. corresponds to the parts 31 and 32 in Fig. 4: and pipe l0 of Figs. 5' and 7 corresponds in function to flue 10 of Fig. d.'

,Pit 20 is preferably provided with a door 30 in Fig. 4 and pit 2O is provided with a door 30* .in lFig. 7 through which ashes or clinkers may be removed from said pit.

lit is to be understood. that the invention is not limited to the precise construction set forth but that it includes within its purview whatever changes fairly come within either the terms or the spirit of the appended claims.

Having described my invention what l claim is: p

1. A furnace of the character'described comprising a primarycombustion chamber of cylindric formation disposed with its axis substantially horizontal and a secondary combustion chamber of substantially inverted coniform shape, the side of the lower portion of which is in communication with an end of the primary combustion cham- 4 her, means for feeding line fuel in suspension tangentially into the primary combustion chamber means for supplying air under pressure tangentially to theprimary combustion chamber and means for supply ing air under pressure to the lower part of the secondary combustion chamber at an angle to the axis thereof.

2. A structure as recited in claim 1 in combination with an enclosing casing for said chambers and means for taking the air supplied to said primary and secondary combustion chambers from a point within said casing.

3. A. structure as recited in claim 1 in combination with a casing enclosing said combustion chambers. a pipe in communication with said air supply pipe and taliing its supply from a point within said ing and a steam jet pipe leading into said air supply pipe for inducing forced therein.

l. A. furnace of the character described comprising a primary combustion chamber of substantially cylindric" form with its axis horizontally disposed and a secondary cornbustion chamber of. substantially inverted coniform shape the side of the lower of which is in communication with an end of the primary combustion chamber a leeches ing within which said chainilwsrs are (anclosed, a pipe located within said casing and a pair of branch fpipes communicating with said pipe,'one 0 which branch pipes discharges tangentially into the primar combustion chamber and the other of whic Y discharges at an angle into the lower end of the secondary combustion chamber.

'5. A structure as recited in clcim 4 in combination with a; steam jet communicat- 1c ingwith said branch pipe for inducing a forced draft therein.

J OHN TAYLOR. Witnessed by:

.GERTRUDE Gmmow MITCHELL,

GERTRUDE MEADOWS. 

